摘要
孔压静力触探作为一种新型的静探技术,可以量测钻进过程中孔隙水压力的大小。基于目前先进的静探设备,根据孔压值对土性变化较敏感的特性,通过锥尖阻力、孔压值和孔压参数比3个指标综合划分了土的类别,结果与钻孔记录吻合良好。在不同深度处量测记录了土中孔隙水压力的消散过程,分析了砂性土和粘性土不同的消散特征。在消散试验的基础上,计算粘性土的固结系数和渗透系数,并与室内试验值进行了对比分析。
CPTU is a new technology for measurement of pore water pressure during drilling.Based on advanced CPTU equipment,three parameters（cone point resistance,pore pressure and pore pressure parameter ratio） are used to classify soil type according to the characteristics that pore pressure is sensitive to the change of soil type.The classified result coincides with the drilling record.The dissipation process of pore water pressure at different depths was recorded and the different dissipation characteristics of sandy soil and cohesive soil were analyzed.On the basis of dissipation test,the consolidation coefficient and permeability coefficient of cohesive soil are calculated and compared with the laboratory test values.
出处
《人民长江》
北大核心
2010年第15期75-78,共4页
Yangtze River
关键词
孔压静力触探
土层划分
固结系数
渗透系数
CPTU
soil classification
consolidation coefficient
permeability coefficient
